#ifndef _MD5_H_
#define _MD5_H_

#include "Common.h"

typedef unsigned char    UINT1;
typedef unsigned char *    POINTER;
typedef unsigned short    UINT2;
typedef unsigned long    UINT4;

typedef struct {
	UINT4    state[4];        // state (ABCD)
	UINT4    count[2];        // number of bit, modulo 2 ^ 64
	UINT1    buffer[64];        // input buffer
} MD5_CTX;

#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21

static UINT1 PADDING[64] = {
	'\x80', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};

/* 
* F, G, H and I are basic MD5 functions. 
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))

/*
* rotate x left n bits
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

/*
* FF, GG, HH, and II transformations for rounds 1, 2, 3 and 4.
* rotation is separate from addition to prevent recomputation.
*/
#define XX(X, a, b, c, d, x, s, ac) { \
	(a) += X((b), (c), (d)) + (x) + (UINT4)(ac); \
	(a) = ROTATE_LEFT((a), (s)); \
	(a) += (b); \
	}
#define FF(a, b, c, d, x, s, ac) XX(F, a, b, c, d, x, s, ac)
#define GG(a, b, c, d, x, s, ac) XX(G, a, b, c, d, x, s, ac)
#define HH(a, b, c, d, x, s, ac) XX(H, a, b, c, d, x, s, ac)
#define II(a, b, c, d, x, s, ac) XX(I, a, b, c, d, x, s, ac)

class Md5
{
private:
	/*
	* MD5 initialization. Begin an MD5 operation, writing a new context.
	*/
	static void MD5Init(MD5_CTX * context)
	{
		context->count[0] = context->count[1] = 0;

		context->state[0] = 0x67452301;
		context->state[1] = 0xefcdab89;
		context->state[2] = 0x98badcfe;
		context->state[3] = 0x10325476;
	}

	/* 
	* MD5 block update operation. Continues an MD5 message-digest
	* operation, processing another message block, and updating the
	* context.
	*/
	static void MD5Update(MD5_CTX * context, UINT1 * input, UINT4 inputLen)
	{
		UINT4 i, index, partLen;

		/* Compute number of bytes mod 64 */
		index = (UINT4)((context->count[0] >> 3) & 0x3F);

		/* Update number of bits */
		if ((context->count[0] += (inputLen << 3)) < (inputLen << 3))
			context->count[1]++;
		context->count[1] += (inputLen >> 29);

		partLen = 64 - index;

		/* 
		* Transform as many times as possible.
		*/
		if (inputLen >= partLen) 
		{
			MD5_memcpy(&context->buffer[index], input, partLen);
			MD5Transform(context->state, context->buffer);

			for (i = partLen; i + 63 < inputLen; i += 64)
			{
				MD5Transform (context->state, &input[i]);
			}

			index = 0;
		}
		else
		{
			i = 0;    
		}

		/* Buffer remaining input */
		MD5_memcpy(&context->buffer[index], &input[i], inputLen - i);
	}

	/* 
	* MD5 finalization. Ends an MD5 message-digest operation, writing the
	* the message digest and zeroizing the context.
	*/
	static void MD5Final(UINT1 digest[16], MD5_CTX * context)
	{
		UINT1 bits[8];
		UINT4 index, padLen;

		/* Save number of bits */
		Encode (bits, context->count, 8);

		/* 
		* Pad out to 56 mod 64.
		*/
		index = (UINT4)((context->count[0] >> 3) & 0x3f);
		padLen = (index < 56) ? (56 - index) : (120 - index);
		MD5Update(context, PADDING, padLen);

		/* Append length (before padding) */
		MD5Update (context, bits, 8);
		/* Store state in digest */
		Encode (digest, context->state, 16);

		/* Zeroize sensitive information.
		*/
		MD5_memset ((POINTER)context, 0, sizeof (*context));
	}

	/* * MD5 basic transformation. Transforms state based on block. */ 
	static void MD5Transform(UINT4 state[4], UINT1 block[64])
	{ 
		UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
		Decode (x, block, 64); 

		/* Round 1 */  
		FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */  
		FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */  
		FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */ 
		FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */ 
		FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */ 
		FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */  
		FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
		FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
		FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */ 
		FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
		FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
		FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
		FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
		FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
		FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
		FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */  

		/* Round 2 */
		GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
		GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
		GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
		GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
		GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
		GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
		GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
		GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
		GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
		GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
		GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
		GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
		GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
		GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
		GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
		GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */  

		/* Round 3 */
		HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
		HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
		HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
		HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
		HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
		HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
		HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
		HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
		HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
		HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
		HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
		HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
		HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
		HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
		HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
		HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */  

		/* Round 4 */
		II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
		II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
		II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
		II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
		II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
		II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
		II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
		II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
		II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
		II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
		II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
		II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
		II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
		II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
		II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
		II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
		state[0] += a; state[1] += b; state[2] += c; state[3] += d;

		/*  * Zeroize sensitive information. */
		MD5_memset((POINTER)x, 0, sizeof (x));
	} 

	/* Encodes input (UINT4) into output (unsigned char). Assumes len is * a multiple of 4. */ 
	static void Encode (UINT1 * output, UINT4 * input, UINT4 len)
	{
		UINT4 i, j;
		for (i = 0, j = 0; j < len; i++, j += 4)
		{
			output[j] = (unsigned char)(input[i] & 0xff);
			output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
			output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
			output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
		}
	}

	/* Decodes input (unsigned char) into output (UINT4). Assumes len is * a multiple of 4. */ 
	static void Decode (UINT4 * output, UINT1 * input, UINT4 len)
	{
		UINT4 i, j;
		for (i = 0, j = 0; j < len; i++, j += 4)
		{
			output[i] = (input[j]) | ((input[j+1]) << 8) |  ((input[j+2]) << 16) | ((input[j+3]) << 24);
		}
	}
	/* * Note: Replace "for loop" with standard memcpy if possible. */ 
	static void MD5_memcpy(UINT1 * output, UINT1 * input, UINT4 len)
	{
		UINT4 i;
		for (i = 0; i < len; i++)
		{
			output[i] = input[i];
		}
	}
	/* * Note: Replace "for loop" with standard memset if possible. */
	static void MD5_memset(UINT1 * output, UINT1 value, UINT4 len)
	{
		UINT4 i;
		for (i = 0; i < len; i++)
			((UINT1 *)output)[i] = value;
	}

	static char* MD5Result(UINT1 digest[16])
	{
		static char temp[40] = {0};
		UINT4 i; 
		for(i=0;i<40;i++)
			temp[i] = 0;
		for (i = 0; i < 16; i++)
		{
			sprintf(&(temp[i * 2]),"%02x", digest[i]);
		} 
		return temp;
	}

public:
	static tstring MD5Encode(tstring tsSrc)
	{
		MD5_CTX context;
		UINT1 digest[16];
		char szResult[128];
		

		UINT4 len = (UINT4)tsSrc.length() * sizeof(TCHAR);

		MD5Init(&context);
		MD5Update(&context, (UINT1 *)tsSrc.c_str(), len);
		MD5Final(digest, &context);
		strcpy(szResult,MD5Result(digest));
#ifdef _UNICODE
		TCHAR szRet[128];
		YY::A2U(szResult,szRet,120);
		return szRet;
#else
		return szResult;
#endif
	
	}
};


#endif